Audio Equalizer

Boost or cut frequency bands to reduce mud, lift presence, or tame harsh highs — then export the result from your browser.

Drop an audio file here

or click to choose from your computer

MP3 · WAV · FLAC · AAC · M4A · OGG

✓ Local processing in your browser · Files are not uploaded to our servers

What is the Equalizer?

An equalizer (EQ) lets you boost or cut specific frequency ranges so a track sits better for your speakers, headphones, or mix. Use it to add weight to thin bass, clear muddy mids, lift vocal presence, or tame harsh highs — without changing the length of the file.

This tool gives you ten peaking bands at the standard ISO octave centers (31 Hz through 16 kHz). Each band can move from −12 dB to +12 dB. Genre presets (Bass Booster, Vocal Boost, Podcast, Rock, and more) set a starting curve you can fine-tune with the vertical sliders.

EQ is one of the most common steps in everyday audio work. A podcast might need a gentle high-pass and a presence lift so speech cuts through laptop speakers. A music track might need a low shelf for warmer bass on earbuds, or a small cut around 2–4 kHz if cymbals feel sharp. Because each band only affects a limited range, you can shape tone without simply turning the whole file up or down like a volume booster.

Preview runs live in your browser through the same filter chain used for export. Your audio is never uploaded to Sound Booster servers. After export you get a WAV file; convert further with the Audio Converter if you need MP3 or another format. Pair EQ with Bass Booster when you want a dedicated low-end push, or with the Volume Booster when the track is still too quiet after tonal balance is fixed.

How it works

Add a file

Drop an MP3, WAV, FLAC, AAC, M4A or OGG file, or open one from Your Library.

Shape the tone

Pick a preset or drag the ten band sliders. The frequency-response curve updates as you move. Press Play to hear a live preview — you can keep adjusting while it plays.

Export

Click Apply EQ & Download. The same 10-band filter chain is rendered offline and saved as a WAV on your device.

Under the hood, ten peaking BiquadFilter nodes are chained in series (Q ≈ 1.41, one-octave bandwidth). That is the same topology used in most DAW graphic EQs. The live preview uses a regular AudioContext; the download uses OfflineAudioContext with identical settings so what you hear is what you get.

Genre presets — what each one does

Flat

All bands at 0 dB. Reset / starting point — use this before dialing your own curve.

Bass Booster

Lifts 31–125 Hz for weight on thin speakers or earbuds. Watch clipping on already-loud masters.

Treble Booster

Adds air and crispness from 4 kHz upward. Helps dull or low-bitrate recordings sparkle again.

Vocal Boost

Cuts mud around 250 Hz and lifts presence at 2–4 kHz so vocals cut through the mix.

Podcast

High-pass-ish low cut plus intelligibility lift — tighter spoken-word audio from real-world mics.

Pop / Rock / Hip-Hop

Smile curves and punchy low end tailored to each style — bass lift with bright tops where it counts.

Classical

Gentle, balanced lift that respects the original mix without forcing a modern “loud” contour.

Loudness (V)

Classic loudness contour for quiet playback on small speakers — boosts bands the ear under-hears at low volume.

Frequently asked questions

How does the EQ work?

Ten peaking filters are chained at ISO octave centers: 31, 62, 125, 250, 500, 1000, 2000, 4000, 8000, and 16000 Hz. Each slider boosts or cuts by up to ±12 dB, with a bandwidth of about one octave, so neighbouring bands blend smoothly. Preview is live through a regular audio chain, and the download is rendered offline with identical settings, so what you hear is what you export.

Which preset should I start with?

Start with Flat, then try Bass Booster for low end, Vocal Boost or Podcast for speech, or Pop, Rock and Hip-Hop for music. Classical is a gentle, balanced lift, and Loudness adds the familiar smile curve for quiet listening. Presets are starting points, so treat them as a first draft and adjust the sliders to taste.

Why does a big boost sound distorted?

EQ adds gain at the frequencies you raise. If the source was already loud, those boosted peaks can clip. Lower the boosts slightly, or normalize with the Volume Booster first and then apply EQ. Cutting a competing band is often cleaner than boosting the one you want to hear.

Does EQ change the file length?

No. Only the frequency balance changes, so duration, tempo and pitch stay the same. That makes EQ safe to apply to a finished track or podcast episode without affecting timing, subtitles or anything synced to the audio.

Is my audio uploaded?

No. Decoding, filtering, and export all run in your browser, and the same filter chain handles both the live preview and the saved file. Nothing from your track needs to be sent to Sound Booster servers for this tool, so unreleased mixes and private recordings stay on your device.

Is it better to boost or cut frequencies?

Cutting is usually the cleaner first move. If a vocal sounds muddy, lowering the 250 Hz area often works better than lifting everything else, and it leaves more headroom. Boosting is fine for adding presence or air, but large boosts raise the level and can clip. A good habit is to cut what bothers you, then add small boosts.

How can I make vocals clearer with the equalizer?

Cut a little around 250 Hz to reduce boxiness, then lift the 2–4 kHz region where consonants and presence live. The Vocal Boost preset does exactly this as a starting point. Make small moves, switch back to Flat to compare, and stop as soon as the voice sounds clear rather than harsh.

Which sliders help with harsh cymbals or sharp highs?

Harshness usually sits in the upper midrange and treble, around 2–4 kHz and sometimes up at 8 kHz. Try a small cut on those sliders and listen on the speakers or headphones you normally use. If the track just sounds dull afterwards, raise the 16 kHz band slightly to bring back some air.

What frequency range does each band cover?

The two lowest bands, 31 and 62 Hz, handle sub-bass and rumble. 125 and 250 Hz control warmth and mud, while 500 Hz and 1 kHz shape the body of voices and instruments. 2 and 4 kHz set presence and clarity, and 8 and 16 kHz add brightness and air. Knowing this helps you pick the right slider fast.

Which output format should I choose after equalizing?

WAV or FLAC keep the EQ result exact, so pick one of those if you plan to edit the file again. MP3, AAC and similar formats are convenient for sharing but add another lossy encoding step. If you want a compressed file, a reliable route is to export WAV first and then convert it with the Audio Converter.

Related tools

Keep editing with other browser-based tools on Sound Booster.